const int_fast8_t ff_left_modifier_c[7] = { 5,-1, 2,-1, 6, 5, 6};
const int_fast8_t ff_top_modifier_c[7] = { 4, 1,-1,-1, 4, 6, 6};
const int_fast8_t ff_left_modifier_c[7] = { 5,-1, 2,-1, 6, 5, 6};
const int_fast8_t ff_top_modifier_c[7] = { 4, 1,-1,-1, 4, 6, 6};